https://bugzilla.kernel.org/show_bug.cgi?id=201685

--- Comment #32 from Azat Khuzhin (a3at.mail@gmail.com) ---

(In reply to Jens Axboe from comment #28)

If it's not this, another hint might be a discard change. Is everyone
affected using discard?

And what a coincidence, before upgrading to 4.20-rc2 I enabled discard:

# findmnt /
TARGET SOURCE                FSTYPE OPTIONS
/      /dev/mapper/cryptroot ext4   rw,relatime,discard

# cat /proc/cmdline
cryptdevice=...:cryptroot:allow-discards

# cryptsetup status cryptroot
/dev/mapper/cryptroot is active and is in use.
  ...
  flags:   discards

Plus I triggered fstrim manually at start:

# systemctl status fstrim
Nov 19 00:16:14 azat fstrim[23944]: /boot: 122.8 MiB (128716800 bytes) trimmed
on /dev/nvme0n1p1
Nov 19 00:16:14 azat fstrim[23944]: /: 0 B (0 bytes) trimmed on
/dev/mapper/cryptroot

But what is interesting here is that it did not do any discard for the "/", hm
(does ext4 did it for me at start?)

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